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Old 19-05-2020, 23:58   #1
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Balmar squealing

Our Balmar is rated for 90A output and connected to house bank.

I admit our batteries are a bit stuffed, and last night the Balmar was putting out 22A into the house batts, and the belt was squealing quite a bit. Throttled back and all was ok at 18A.

Its a gates green stripe V belt, and tension and alignment looks ok (but I will double check).

My question is I assume that 22A should be no problem for this alt, even with a V belt, and there is no need for it to squeal if all is in working order right?

I have also de-rated the regulator, so I am disappointed there is still squealing.
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Old 20-05-2020, 02:06   #2
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Re: Balmar squealing

you have belt / pulley issues. either too lose or something is bad.

I installed a 200a alt today on boat. at first it squealed over 100a. I tightened the double v belt. no squealing at 200a. well I measured 198a...

22a is nothing.
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Old 20-05-2020, 14:47   #3
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Re: Balmar squealing

If it is the belt that is squealing, either it is ready to break, or it needs tightening. It should only deflect about a cm. If it is at the end of its lifetime, and you tighten it, it will break soon.

For a high output alternator, use the best dang belts you can find.

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Old 20-05-2020, 15:03   #4
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Re: Balmar squealing

What is nice is the Balmar external reg that ramps up the load nice and slowly so no sudden shock on the belts !
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Old 20-05-2020, 16:59   #5
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Re: Balmar squealing

Don't discount the possibility of a dud bearing in the alternator either!
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Old 20-05-2020, 18:05   #6
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Re: Balmar squealing

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Don't discount the possibility of a dud bearing in the alternator either!
Should be able to distinguish between belt and bearing noise by use of the "mechanic's stethoscope", ie a stiff dowel or a screwdriver with one end on the alternator case and the other in your hand and pressed to an ear. If a bad bearing is present, the noise will be evident immediately.

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Old 20-05-2020, 18:19   #7
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Re: Balmar squealing

By the way, don't be fooled by the "magic" belt dressings that claim to eliminate belt squeaks. Don't even think about going there ... unless you have a replacement belt on hand.
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Old 20-05-2020, 18:22   #8
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Re: Balmar squealing

Bearing noise won’t usually decrease with load, and is usually a grinding noise, a whirring sort of roar.
V belts are problematic, I gave up and went serpentine, my factory 80 amp are them
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Old 20-05-2020, 18:47   #9
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Re: Balmar squealing

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By the way, don't be fooled by the "magic" belt dressings that claim to eliminate belt squeaks. Don't even think about going there ... unless you have a replacement belt on hand.
That's odd... I used a spray can "belt grip" potion very successfully on our previous boat, driving a 120 A alternator with a 1/2 inch belt. Helped a lot and did not seem to cause shortening belt life.

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Old 20-05-2020, 19:12   #10
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Re: Balmar squealing

I think a single V-belt is supposed to be good to about 100 amps.
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Old 20-05-2020, 19:43   #11
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Re: Balmar squealing

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Originally Posted by Jim Cate View Post
That's odd... I used a spray can "belt grip" potion very successfully on our previous boat, driving a 120 A alternator with a 1/2 inch belt. Helped a lot and did not seem to cause shortening belt life.

Jim

+1 for belt grip. It's good stuff. I've used it on worn out printer rollers to get a bit more life out of them. Just need to run off a few test pages after application.



We used to rub a bar of soap on squealing car belts back in the old days to stop them squealing. Not sure what happened if the belt got wet but I don't recall anyone complaining.
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Old 22-05-2020, 03:08   #12
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Re: Balmar squealing

If its the bearing take the belt of and spin it by hand .. you will hear and feel if its the bearing.
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